Machine for punching.



No. 865,857. PATBNTED ISEPT. 1o, 1907.

s. c. BOND.

MACHINE PoR PUNGHING.

APPLIOLTION FILED DBO.23,1902.

W L -W 2% n If 3 C. BOND, OF WILMINGTON, DELAWARE.

MACHINE son PUNGHING.

Y No. 865,857'.

specification of Letters Patent.

Patented' sept. 1o, 1907.

Y Application ledDecember 23,1902. SerialNo: 136,891.

To all whom 'it may concern:

Be it known that I, SAMUEL C. BOND, a citizenof the United States,residing at Wilmington, in the county of Newcastle, State of Delaware,have invented a new and useful Improvement in Machines for Punching, of

which the following is a specification.

My invention relates to a machine for punching, which will supply thepressure to the punch plunger only in such amounts as will be requiredto remove the from the reservoir 18 to the cylinder 11 but permits arequired amount of material from the article to be punched.

lt further consists of novel details of construction, all as will behereinafter setforth.

Figure 1 represents a sectional view and partial side elevation of apunching machine embodying my invention. Fig. 2 represents a front viewwith'valves and ports shown in section." Fig. 3 represents a sectionalview of the punch showing the relative position of the punch, slug,plate and die after the material has been sheared. Y Reierring to thedrawings: 1 designates the hook or I frame to which is secured the dieblock 2 and the high pressure cylinder 3, in which reciprocates thepunch plunger 4 carrying withA it the punch 5, the punch nut 6 and thepacking leather 7 and the pull-back gland 8, said packing being situatedbetween the gland 8 and the plunger 4. i 4

To the high pressure cylinder 3 is secured the diaphragm 9 which hassecuied thereto the cylinder head 10 and cylinder or casing 11. Y

12 is the piston which reciproeates in the cylinder' 11 ahd to which issecured the rod 13, which passes through the cylinder head 10 and hastheyenlargd portion 14 and on one end the head 15, which is adapted toengage e with the pulllhack gland 8 and the, end o the chamber 16respectively, at or near the end of the stroke of the piston 12.

17 is the high pressure packing which is situated betweenthe gland 8'and the reservoir V18 and in conjunction with tlie enlargedportion 14of the rod 13, forms a closure for the communication between the highpres-- sure cylinder 3 and thesaid low pressure reservoir 18, which isformed by the diaphragm 9 and the cylinder head 10. p e

19 is the low pressure packing w pressure gland 20 around the rod 13events all 'flow-- ilow to take place in the reverse direction'.

` 21 is the filling plug by which a liquid i's admitt to the reservoir18. i

22 is a stop ring which limits the t 4` plunger 4, through the stripper23 an 25 represents the valve chamber, the projecting -endv 25a of whichserves asa grip ,for the hand, said valve 3-1 being readily operated bythe thumb of the hand holding the gripr25l and as will readily be seenthe reaction with the 10W.:

due to the operation of said valve is absorbed between the valve 3l andthe grip 25" instead of the valve and the inertia ofthe machine, as inmachines constructed l heretofore; this feature enables the operator tooperate the valve without disturbing the relation oi the machineto thework. This chamber contains the admission port/26 and has thecontrolling ports 27 and 28, one

,of Awhich communicates with the upper portion of the interior of thecylinder 11 while the other communicates with the lower portion, saidchamber 25 having also the lexhaust ports 29 and`730,

31 is the balanced controlling valve operatedlby the thumb or fingersaid valve 31 being readily operated by the thumb ef the hand holdingtheshell ormingthe valve chamber 25.

38 represents the punch in the act of pushing the slug 39 from the plate40 through the die 41. Y

The op eration is as follows The reservoir 18 is filled with a suitableliquid, the hose or other fluid conveyer is attached to the admissionport 26 withthe controlling lvalve 31 in the position shown, the motivefluid passing from the port 26 through the port 27 and packing 19 to thereservoir 18 and b'etween the piston 12 and the cylinder head 10 therebyholding the punch plunger 4 at one end of its travel by the head 15 andthe gland` 8 against the pressure of the motive fluid on the liquid inthe reservoir 18, which liquid will be readilr seen, exerts a pressureon the punch plunger 4by passing between the high pressure packing 17and the shaft 13. The material to .be operated upon is then placed onthe die 24 and the valve is then moved connecting the port 27 with theexhaust port 29 exhausting the ...motive fluid `irom between thecylinder head 10 and the piston 12 but not from the reservoir 18; thepressure on the iuid being retained by the packing 19, the valve, at the`same time, 'admits the motive fluid through the ports 26 and 28'betweenthe piston 12 and the cylinder l1, causing the piston 12 and the rod V13to move sov towards the head 10, the punch plunger 4 at the same l timemoves toward the die 24, which action is due to the pressure of themotive iuid in the reservoir 18 'Y .being exerted uponthe liquid in thesame and ceases when the punchcomes in contact with the material tobepunched. The piston 12in the meantime has been moving towards the head10 but keeping in the same fprelative 'position-with respect to 'thepunch plunger -Aand as it v continues to move inthe same direction itoses communication between the high pressure cylineservoir 18 bythe'enlarged portion 14 of s the rod\13 entering the-high pressurepacking 17 and forming anfeffective closureQA VThis action causes thepressure inthe high pressure cylinder .3 to become intensified-due tothe iperence in area of the piston 12 i121'4 of the rod 13. The inten.-V ed on the punch plunger 4 until the enlarged portion 14 of the rod 13has passed entirely through the high pressure packing 17, the punch 5and slug 39 are then in the position shown in Fig. 3 and communicationis again established between the reservoir18 and the high pressurecylinder 3, causing the punch plunger 4 to continue its travel underdirect pressure until arrested by the stop ring 22. This contrnuatron ofthe travel is due partly to the direct action of the motive iiuid on thepiston 12 through the rod 13 and head 15 on the end f the chamber 16 andpartly to the pressure of the motive fluid on the liquid in the`reservoirxl8 acting on the plunger 4. The valve is fore, desire to belimited in every Ainstance to the exact construction herein shown anddescribed.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is

1. In a punching machine, a punch plunger and mea/ns for operating thesame, said means comprising provision for a maximum pressure and forautomatically reducing that pressure, the maximum pressure being exertedduring the performance of the vWork and the reduced pressure during theexpulsion of the slug. 'l

`2. In a punching machine, a punch and' die and means for operating thesame, said means comprising provision for a maximum pressure forshearing the material and for automatically reducing such pressure and areservoir of power for storing sucient pressure to expel the materialsheared.

3. In a punching machine, a high pressure cylinder, a low pressurer'eser'voir, a plunger, a rod therefor adapted to4 reciprocate in saidcylinder andreseryolrfand means for exerting a low pressure at -thebeginning and ending of the str'oke of the plunger and for exertinga.maximum pressure.

4. In a punching machine, a high pressure cylinder', a low pressurereservoir in communication with' said cylinder, a piston, a r'od forsaid piston and an enlarged portion on said rod, and lpacking whichisndapted to closely fit said enlarged portion when the same passesthereinto to prevent communication between'tbe high pressure cylinderVand low .pressure reservoir; said enlarged portion passing completelythrough said packing thereby, again establishing communication betweensaid high pressure cylinder and low pressurereservoir.

5. I n a punching machine, a cylinder, a punch plunger adapted toreciprocate 'in said'cylinder, a r'eservoir in communication with saidcylinder means for intensifying pressure vrithiu said cylinder, aclosure for Vsaid communicatlon while intensifying the pressure in saidcylinder and means of again establishing said communication dur'- ing'the travel of said punch plunger' in same direction.

'6. ln a punching machine, a high pressure cylinder, a low pr'essurereservoir, a rod having a head which is adapted to reciprocate in saidcylinderfa plunger', a gland secured thereto with which said head isadapted to engage on'the return stroke, a packing between saidcylnderand said reser'voir, an enlarged portion of said r'od adapted to form aclosure with' said packingT between saidcylinder and said reservoir, asec'ond cylinder, a piston connected with said ,rod and adapted'toreciprocate in said cylinder',

and means for contacting the motive fluid on either side of said pistonas required.

7.1In a punching machine, a high pressure cylinder, al

SAML. C. BOND.-

Witnesses:

GEORGE ARMOR, W. V. BOND.

